I have 3 or 4 KN6 Krytrons they are commonly used in certain laser system triggers where precise firing is needed. Due to their application as special bomb triggers they are considered "dual use" devices and are export controlled. The Sprytron is a pico second delay trigger and I do not think they are commonly available. Both the krytron and sprytron are capable of massive currents but the life span for the krytron is under 1000 firings at its limit. Lighter currents will extend its life span.
The sprytron, by desgn application, is typically a one shot consumable.
Progress may have been a good thing once, but it just went on too long. - Yogi Berra
Fusion is the energy of the future....and it always will be
Retired now...Doing only what I want and not what I should...every day is a saturday.